Stoker



Oct 3, 1939.

F. P. ROESCH STQKER Filed March l0, 1936 2 Sheets-Sheet 1 F. P. ROESCH Oct. 3, 1939.

STOKER Filed March 10, 1956 2 Sheets-Sheet 2 mm m M w Ww A MJ Patented Oct. 3, 1939 UNITED STATES STOKER Frank P. Roesch, Chicag assignments, to The Inc., New York, N. ware o, Ill., assignor, by mesne Standard Stoker Company, Y., a corporation of Dela- Applicaton March 10, 1936, Serial No. `68,016

7 Claims.

My invention relates to stokers for locomotive or other boiler furnaces, and is more particularly concerned with improvements in stokers of the type in which fuel is conveyed from a source of supply to an oscillating member that acts to throw or project the fuel into the rebox.

One of the objects of the invention is the provision of a novel fuel throwing or projecting member of the rotating paddle type arranged to project increments of fuel to varying distances lengthwise of the rebox during each complete revolution of the projecting member without change in the speed of rotation thereof whereby increments of fuel are delivered successively to the front, intermediate and rear portion of the firebox.

Another object of the invention is to provide in a stoker of the character specified a novel construction of fuel casing and associated parts and the embodiment therein and relation therewith of the novel fuel projecting member.

With the above and other objects and advantages in view, the invention consists in the features of construction, the combination of elements and arrangement of parts hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which,

Fig. 1 is a central vertical longitudinal section of the adjacent portions of a locomotive and its tender showing the invention in similar section, with parts shown in elevation;

Fig. 2 is a View in section on the line 2 2 of Fig. 1 with the locomotive cab deck removed;

35 Fig. 3 isa view in section on the line 3 3 of Fig. 1;

Fig. 4 is a view in section on the line 4 4 of Fig. 2;

Fig. 5 is a view in section on the line 5 5 of 40 Fig. 3; and

Fig. 6 is a view in section on the line 6 6 of Fig. 4.

1n the drawings, a locomotive is designated generally by the numeral I0, connected by a coupling Il with a tender I2. The locomotive is provided with a firebox I3 and a backhead I4 having a firing opening I5 therethrough and a cab deck I6 extending rearwardly therefrom below the level of the ring opening I5. The coal or other fuel is carried in a receptacle or bin I'I on the tender and a stoker, indicated as a whole at i8, receives the fuel from the bin I1 through an aperture I9 in the floor 2li. thereof, controlled by the shiftable 55 plates 2|., and conveys it forwardly from beneath the bin I1 to the iirebox I3 and scatters the fuel over the fire.

The conduit system of the stoker I8 includes a transfer conduit having a rear or trough portion 22 mounted on the tender beneath the bin I'I and a tubular portion 23 communicating with and extending forwardly from the trough 22 to the locomotive, and a riser conduit 24 communicating with the forward end of the tubular portion 23 and extending upwardly from beneath the deck m I6 to the lower portion of the firing opening I5. Screw conveying means 25 advances fuel through the trough 22 and tubular portion 23 and a screw conveyor 26 elevates the fuel through the riser conduit 24. The lower end of the riser conduit 24 has a rearwardly extending portion 21 terminating in a spherical seat portion 28 arranged to receive a ball member 29 which slidably receives the forward end of the tubular conduit portion 22 to provide for universal as well as 20 relative longitudinal movement between the riser and transfer conduits as relative movement occurs between thelocomotive and tender. The riser conduit 24 is rigidly secured to the mud ring 30 of the locomotive boiler by a bracket 3 I, so that 25 the riser conduit moves with the backhead I4 as expansion or contraction of the boiler sheets occurs due to variations in temperature.

The screw conveying means 25 is driven, prefo erably from its rearward end, by suitable power "l means, not shown. The elevator screw 26 is driven from its lower end through shaft which extends into the gear casing 38 and has keyed thereto a worm wheel 3-1, the latter being meshed by a worm 36 which is provided externally of the gear casing 38 with a universal joint jaw 9 to form an operative connection with the power driven shaft 8.-

The lower end of the elevating screw 26 has an opening 39 which slides over or telescopes a complementary projection 4I]V on the elevator drive shaft 35, the screw 26 and drive shaft 35 being operatively connected by the pin 4I and key 4Ia. The elevator drive shaft projects through' the cover 42 of the casing 38 and is enclosed by a dust sealing sleeveV portion 43 of the screw 26 and has a flight 44- cast integral therewith which forms a continuation of the flight of the elevating conveyor screw 26. The cover 42 is provided with a dust flange 45 arranged to be received in the sealing sleeve 43, and is equipped with ribs or threads 46 to prevent the dust from rising above the upper edge of the ange.

The lower end of the shaft 35 has a collar 41,

resting upon anti-friction bearing 48, held in a flange 49- carried by the casing 38. The cover 42 has a depending flange 50 forming a seat for anti-friction bearing 5l, mounted upon the extension 52 of worm wheel 31.

The riser conduit 24 is spaced from the backhead I4 and at its discharge end carries a ledge 53 flaring laterally as it extends forwardly into the lower portion of the firing opening l5. A dome-like cover or hood 54 surmounts the riser conduit 24, and is provided with side walls 55 and 56 extending forwardly of the roof portion 51 cf the hood 54. The side walls 55 and 58 flare laterally as they extend forwardly and rest on the ledge 53 forming retaining walls for the fuel emerging from the riser conduit 24. The opening between the roof 51 of the hood 54 and the upper marginal edge of the firing opening constitutes a hand firing opening, and a iiredoor 58, preferably power operated, and of any suitable design, is mounted on a firedoor flange 59 which is rigidly secured to the backhead i4 and forms a closure for the hand firing opening.

Fuel delivered onto the ledge 53 from the riser conduit 24 is projected therefrom by a paddle 99 across the distributing table 6i into the firebox. The distributing table is supported by the ledge 53 in any suitable manner, and is provided with means such as the J-ribs 62 and laterally opening pockets 63 for deflecting the projected fuel. The paddle 99 is carried by a shaft 64 that extends upwardly from beneath `the level of the cab deck I8 between the backhead i4 and the riser conduit 24 and through an opening 95 in the ledge 53. The shaft 34 is mounted at its upper end in the roller bearing 66 in the ledge 53 and at its lower end in the roller bearing 61 in the casing 88. The casing 38 is provided with flanges 1 through which it is rigidly secured to the riser conduit 24 by means of bolts 6.

The portion of the shaft 64 in the casing S8 carries a pinion 69 which forms a part of the mechanism for oscillating the paddle 69. Said oscillating mechanism includes a horizontally disposed rack member 1D which constantly meshes through its teeth 1! with the pinion 69, so that oscillating movement is communicated to the paddle 69 when the rack member 10 is reciprocated in the horizontal cylinder 12 by the motor hereinafter described. The motor cylinder 12 and casing B8 are preferably formed as an integral unit. The parts are so proportioned and arranged that the paddle 69 makes two complete revolutions in each direction before reversing.

The motor or engine 13 by which the paddle 89 is operated independently of the fuel conveying screws may be of any suitable construction. As here shown the actuating rack 10 carries at one end a piston 14 and at its opposite endV a piston 15.

As shown in Fig. 3, the piston 14 is at the end of its rightward stroke or its stroke away from the valve-chest 15 of the motor 13. As it nears the end of the rightward stroke, the threaded ring washer 11 of the piston V14 engages the enlargement 18 at the right end of the valve rod 19 and draws the operating valve 88 to the position shown in Fig. 3, thereby exhausting the steam immediately above the piston 89 of the differential distributing valve 8l, permitting it to be moved to the position shown. Thus, the port 82 receives steam from the intake which will gain access to the outer face of the piston 15 through the vent 83 resulting in starting a slow movement of the piston leftward, the slow movement continuing until the piston 15 clears the large Vent 84 which, when clear, admits a full volume of steam into the cylinder 12 through substantially the full stroke of the piston. As the piston 14 approaches the opposite end of the cylinder 12 it passes over and closes the vent 90 of the port 85, thereby restricting the escape of the steam ahead of the piston 14 to the small vent 88. This results, in effect, in forming a cushioning chamber ahead of the piston 14 oifering resistance to its movement, reducing its speed and cushioning the action of the connected parts up to and including the paddle 60.

As the piston 14 nears the end of the stroke to the left the ring washer 11 engages the enlargement 81 at the left end of the valve rod 19 and pushes the connected operating valve to the left, thereby establishing communication between the steam intake and the port 88, thus admitting steam pressure against the upper face of the piston 89 of the differential distributing valve 8l, moving it to a position opposite to that shown in Fig. 3. Thus the port receives steam which will gain access to the outer face of the piston 14 through the vent 86 resulting in starting a slow movement of the piston rightward, the slow movement containing until the piston 14 clears the large vent 90 which, when clear, admits a full volume of steam into the cylinder 12.

The paddle 60 is provided with arms 91, 92 and 93, the arm 9| being longer than the arms 92 and 93, and the arm 92 being longer than the arm 93. Fuel is continuously discharged from the riser conduit 24 into the zone of action of the paddle 99 so that each of the arms 9|, 92 and 93 will project fuel into the irebox. Since the peripheral speed of each arm is proportionate to its length, the long arm 9| will throw the fuel a further distance than either of the arms 92 and 93 and will deliver most of its charge to the 'fro-nt of the rebox, while the arm 92 will feed the central part of the rebox and the shortest arm 93 will feed the rear of the rebox. The upper ends of the arms are flared, as shown in Fig. 6, to hold the fuel down while they are sweeping across the distributor plate providing more effective distribution bythe plate and reducing the amount of fuel that is carried over the firebox arch by the draft.

The riser conduit 24 is provided with a removable closure or door 94 whereby access may be had to the interior of the lower end of the conduit. W'hen it is desired to remove the closure 94, as when a clog occurs, the hinged door 95 in the deck I6 is swung back providing an opening of suflicient size to permit removall of the closure 94. Y

I' claim: l

i. In combination with a furnace having an upstanding wall provided with a firing opening therein, an upwardly opening stoker conduit exterior of the iirebox extending upwardly from an point below the level of the ring opening to the lower portion of the firing opening, the marginal edges of the conduit defining its open upper end lying in a plane extending transversely of the direction of travel of the fuel through said conduit, a ledge extending forwardly and flaring laterally from the discharge end of said conduit into the nring opening, a removable hood surmounting the open upper end of said conduit forming a forwardly opening discharge outlet therefor to the firing opening, said hood having upstanding laterally flaring side Walls extending forwardlybeyond the forward edge of the roof of said'hood into the firing opening, saidside walls-being disposed immediately above said ledge forming fuel retaining side walls.

2. In combination with a furnace having an upstanding wall provided with a firing opening therein, an upwardly opening stoker conduit exterior of the iirebox extending upwardly from a point below'the level of the ring opening to the lower portion of theV ring opening, the marginal edges ofthe conduit dening its open upper end lying in a plane extending transversely of the direction of travel of the fuel through said conduit, a ledge extending forwardly and flaring laterally from the discharge end of said conduit into the firing opening, a removable hood surmounting the open upper end of said conduit forming a forwardly opening discharge outlet therefor to the firing opening, said hood having upstanding laterally flaring side walls extending forwardly beyond the forward edge of the roof of said hood, said side walls being seated on said ledge forming fuel retaining side walls, and rotatable fuel throwing means disposed immediately above said ledge between said side walls for projecting fuel into the iirebox, said side walls extending forward of the farthest forward point in the path of said rotatable fuel throwing means.

3. In combination with a furnace having an upstanding wall provided with a ring opening therein, an upwardly opening stoker conduit exterior of the iirebox extending upwardly from a point below the level of the firing opening to the lower portion of the firing opening, the marginal edges of the conduit dening its open upper end lying in a plane extending transversely of the direction of travel of the fuel through said conduit, a ledge extending forwardly and flaring laterally from the discharge end of said conduit into the firing opening, a removable hood surmounting the open upper end of said conduit forming a forwardly opening discharge outlet therefore to the firing opening, said hood having upstanding laterally iiaring side walls extending forwardly beyond the forward edge of the roof of said hood, said side walls being seated on said ledge forming fuel retaining side walls, and rotatable fuel throwing means disposed immediately above said ledge between said side walls for projecting fuel into the iirebox, said last named means having a plurality of fuel throwing arms extending outwardly different distances from the hub thereof, and said side walls extending forward of the farthest forward point in the path of said fuel throwing arms.

4. In combination with a furnace having an upstanding wall provided with a firing opening therein, an upwardly opening stoker conduit exterior of the firebox extending upwardly from a point below the level of the firing opening to the lower portion of the firing opening, the marginal edges of the conduit dening its open upper end lying in a plane extending transversely of the direction of travel of the fuel through said conduit, a ledge extending forwardly and aring laterally from the discharge end of said conduit into the firing opening, a removable hood surmounting the open upper end of said conduit forming a forwardly opening discharge outlet therefor to the firing opening, said hood having upstanding laterally lflaring side walls extending forwardly beyond the forward edge of the roof of said hood, said side walls being seated on said ledge forming fuel retaining side walls, a rotatr in the path of said vrotatable fuel throwing means,

a motor for operating said throwing means and a shaft extending upwardly from saidmotorbetweeni said upstanding wall and said stoker conduit through said ledge, said shaft operatively connecting said motor and said throwing means.

5. In combination with a locomotive having a a rebox provided with an upstanding wall having a ring opening therein and a cab deck extending rearwardly therefrom, an upwardly opening stoker conduit exterior of the rebox extending upwardly from a point below said deck to the lower portion of the firing opening, the marginal edges of the conduit defining its open upper end lying in a plane extending transversely of the direction of travel of the fuel through said conduit, a ledge extending forwardly and flaring laterally from the discharge end of said conduit into the firing opening, a removable hood surmounting the open upper end of said conduit forming a forwardly opening discharge outlet therefor to the firing opening, said hood having upstanding laterally flaring side walls extending forwardly beyond the forward edge of the roof of said hood, said side walls being seated on said ledge forming fuel retaining side walls, a rotatable fuel throwing means disposed immediately above said ledge between said side walls for projecting fuel into the iirebox, said side walls extending forward of the farthest forward point in the path of said rotatable fuel throwing means, a motor beneath said cab deck for operating said throwing means and a shaft extending upwardly from said motor between said upstanding wall and said Stoker conduit through said ledge, said shaft operatively connecting said motor and said throwing means.

-6. In a locomotive having a rebox provided with an upstanding wall having a firing opening therein and a cab deck extending rearwardly therefrom, a stoker conduit exterior of the firebox extending upwardly from a point below said deck to the lower portion of the firing opening and spaced from said upstanding wall a distance less than its own diameter, a ledge extending forwardly from the discharge end of said conduit into the firing opening, a screw conveyor in said stoker conduit for elevating fuel therethrough to said ledge, a rotatable fuel throwing means for projecting fuel into the rebox, a motor beneath the level of said cab deck and .upstanding wall for operating said throwing means and a shaft extending upwardly from said motor between said upstanding wall and said stoker conduit through said ledge, said throwing means being supported by said shaft and located immediately above said ledge, said shaft operatively connecting said motor and said throwing means.

7. In a loco-motive having a rebox provided with an upstanding wall having a firing opening therein and a cab deck extending rearwardly therefrom, an upwardly opening Stoker conduit exterior of the iirebox extending upwardly from a point below said deck to the lower portion of the ring opening and spaced from but close to said upstanding wall, a ledge extending forwardly and flaring laterally from the discharge end of said conduit into the firing opening, a removable hood surmounting the open upper end of said conduit forming a forwardly opening discharge outlet therefor to the firing opening, said 76 Elin for operating said throwing means and a shaft extending upwardly from said motor between said opstanding wall and said stoker conduit through said ledge, said throwing means being supported by said shaft and located immediately above saidy ledge, said shaft operatively connecting said motorA and said throwing means.

FRANK P. ROESCH. 

